*{
	padding: 0;
	margin: 0;
}
.app{
	width: 100%;
	height: calc(100vh);
	background:black url(../img/bg.jpg)no-repeat;
	background-size: 100% 100%;
	
}
.cnt{
	width: 100%;
	position: absolute;
	top:50%;
	left: 50%;
	transform: translate(-50%,-50%);
}
.bnt1{
	width: 50%;
	margin: 0 auto 2rem;
}
